Question

(корень63-корень28)*корень7

Answer 1

$(sqrt{63}-sqrt{28})sqrt7=sqrt{63*7}-sqrt{28*7}=sqrt{7*9*7}-sqrt{7*4*7}=\=21-14=7$

Answer 2

(√63 - √28)* √7 = (3√7 - 2√7) *√7 = √7*√7 = 7

 

ОТВЕТ: 7